Please evaluate my system...

All good stuff. What aspects of the sound do you find lacking?

Off the cuff, have not heard that amp but on paper its input impedance is on the low side for use with a tube pre-amp. 60Kohm input impedance or higher ( a common rating for amps designed to work well with tube pre-amps) would likely yield better dynamics and less distortion. Also I would probably think twice about using a zero feedback amp (higher output impedance) with speakers that dip below 4 ohm impedance at some frequencies despite 8ohm nominal rating.

So teh overall integration of amp/pre-amp/speakers is worth considerations and some discussion and might be improved if you find there are issues with dynamics, detail and/or tonality.

Also of course worthwhile making sure speakers are set up well? Enough distance from walls to avoid early reflections that obscure detail? Isolated from floors perhaps if fllors are not a solid foundation rather suspended plywood? Fat or too much mid bass that obscures mid-range detail would be an indicator of that.

Tim,

I find cartridges are more of a suit to taste component: once you get above the low entry level, one isn't necessarily "better" then another. If you like the Denon DL-103. I say, stick with it - they make fantastic music. Maybe buy another different cart and swap every so often for a different presentation...

But, there are ways to get the most out of DL-103. I would recommend a Cinemag based Step Up Transformer (you can build your own quite easy). I would also recommend an aluminum body cap for the cartridge.

https://www.stereophile.com/content/bobs-devices-cinemag-1131-phono-transformer

http://cinemag.biz/phono/phono.php

https://www.denonaluminumbody.com

+1 srbedard! The venerable DL103 certainly punches well above its weight - and remains a long-time favorite of mine! And can be modded (change to a wood or metal body) for even higher SQ!

And kudos to the recommendation for the Cinemag SUT! It's a very good one!